package com.itheima.controller;

import com.itheima.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

//@RestController
//@RequestMapping("/common")
public class CommonController {

    private String basePath="D:/img/";

    @PostMapping("/upload")
    public R upload(MultipartFile file){

        String originalFilename = file.getOriginalFilename();
        int i = originalFilename.lastIndexOf(".");

        String suffix = originalFilename.substring(i);
        String fileName = UUID.randomUUID().toString()+suffix;


        File dir=new File(basePath);

        if (!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);

    }


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        BufferedInputStream bis=null;
        ServletOutputStream os =null;
        try {
            bis=new BufferedInputStream(new FileInputStream(basePath+name));
            byte[] bytes=new byte[1024];
            int len;
            response.setContentType("image/jpeg");

                os = response.getOutputStream();
            while ((len=bis.read(bytes))!=-1){
                os.write(bytes,0,len);
                os.flush();

            }

        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }

    }
}
